212001002121 has 4 divisors (see below), whose sum is σ = 282668002832. Its totient is φ = 141334001412.

The previous prime is 212001002069. The next prime is 212001002149. The reversal of 212001002121 is 121200100212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 212001002121 - 2¹⁰ = 212001001097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212001002097 and 212001002106.

It is not an unprimeable number, because it can be changed into a prime (212001002021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35333500351 + ... + 35333500356.

It is an arithmetic number, because the mean of its divisors is an integer number (70667000708).

Almost surely, 2^212001002121 is an apocalyptic number.

It is an amenable number.

212001002121 is a deficient number, since it is larger than the sum of its proper divisors (70667000711).

212001002121 is an equidigital number, since it uses as much as digits as its factorization.

212001002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70667000710.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 212001002121 its reverse (121200100212), we get a palindrome (333201102333).

The spelling of 212001002121 in words is "two hundred twelve billion, one million, two thousand, one hundred twenty-one".